冲击波-破片群联合作用下舰船复合材料结构近场动力学损伤模拟

采用一种新兴的无网格法——近场动力学理论，模拟复合材料结构在冲击波-破片群联合作用下的损伤情况。根据复合材料结构承受的载荷特性，分析冲击波-破片群联合作用下层合板及加筋板结构的损伤模式，考虑载荷作用次序等因素对于联合作用毁伤能力的影响规律。结果表明:联合作用对复合材料结构的损伤程度主要与冲击波强度、破片群侵彻能力、作用次序有关，主要损伤模式为分层失效、基体损伤、剪切损伤以及结构大变形；对于层合板而言，在冲击波先作用的工况下，结构损伤程度更高，损伤范围更大；对于加筋板而言，由于加筋板的筋条能显著降低冲击波作用，进而降低冲击波对破片群侵彻能力的增强效应，最终影响联合作用的毁伤能力，因而在破片群先作用的工况下反而损伤更严重。

Peridynamic damage simulation of ship composite structures subjected to combined action of shock wave and fragments

In recent years, as a hot area of computational mechanics, an emerging meshless method, namely peridynamic, has attracted the attention of researchers. The peridynamic theory attempts to unify the mathematical models of continuum, cracks, and particles into one framework, so it is essentially a mechanical model independent of the scope of continuum mechanics. The governing equation of peridynamic adopts the spatial integral form, and the continuity of the field function is no longer required. Compared with the traditional methods based on continuum mechanics, the peridynamic method has a great advantage in dealing with discontinuity problems, such as crack propagation and other fracture problems. In this paper, the peridynamic method is adopted to study the damage characteristics of composite structure under the combined action of shock wave and fragment group. The damage mode of the laminated plate and reinforced plate structures are analyzed, and the influence of the load sequence and other factors on the damage ability is considered. The results show that the damage degree of the composite structure under the combined action is mainly related to the shock wave strength, the penetration ability of the fragment group, and the order of action. The main damage modes are delamination failure, matrix damage, shear damage and large structural deformation. When the shock wave acts first, the structural damage is serious and the damage range is larger. The ribs of the reinforced plate significantly reduce the impact of the shock wave action, and then affect the joint action, hence its deformation, displacement and structural damage are greatly reduced compared to the laminates, the damage is more serious when fragment group acting first.